CN107294059A - Use electric detection means - Google Patents
Use electric detection means Download PDFInfo
- Publication number
- CN107294059A CN107294059A CN201610202233.9A CN201610202233A CN107294059A CN 107294059 A CN107294059 A CN 107294059A CN 201610202233 A CN201610202233 A CN 201610202233A CN 107294059 A CN107294059 A CN 107294059A
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- detection means
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to one kind electric detection means, including：Self-test unit, for periodically producing simulation electric leakage signal in Auto-Sensing Mode；Leak current fault detection unit, leak current fault is detected for detecting the simulation electric leakage signal in the Auto-Sensing Mode, and in leak current fault detection pattern；And under-voltage protection unit, for being less than voltage pre-set value in supply voltage in the case of forbid the self-test unit to produce the simulation electric leakage signal.Moreover, it relates to a kind of electric connecting device with this use electric detection means.The present invention by possess at the same time detection of electrical leakage and self-checking function with increasing under-voltage protection unit on electric detection means so that self-checking circuit, without self-inspection, and avoids false tripping phenomenon under undervoltage condition.
Description
Technical field
The present invention relates to domestic circuit field, in particular it relates to one kind electric detection means.
Background technology
With the continuous improvement and electric equipment products of people's living standard use it is increasingly general
And, people are also increasingly paid attention to using safety electrical equipment.Therefore the electric leakage with defencive function
Detection means is arisen at the historic moment.Currently, have been devised by one kind and be provided simultaneously with detection of electrical leakage and self-inspection
The relay system of function uses electric detection means.
However, current does not have under-voltage protecting circuit with electric detection means.Therefore, in low electricity
During pressure (being less than product rated voltage or lower), it may appear that false tripping phenomenon.
Therefore, need badly and a kind of to use electric detection means with under-voltage protecting circuit.
The content of the invention
Therefore, it is an object of the invention to provide one kind electric detection means and with the electricity consumption
The electric connecting device of detection means.This can be avoided under low voltage condition with electric detection means
False tripping phenomenon.
To achieve the above object, the first aspect of the present invention provides one kind electric detection means,
Including：Self-test unit, for periodically producing simulation electric leakage signal in Auto-Sensing Mode；Leakage
Electric fault detection unit, for detecting the simulation electric leakage signal in the Auto-Sensing Mode, with
And detect leak current fault in leak current fault detection pattern；And under-voltage protection unit, for
Supply voltage forbids the self-test unit to produce the mould in the case of being less than voltage pre-set value
Intend electric leakage signal.By the above-mentioned means, under-voltage protection unit causes self-test unit in under-voltage feelings
Do not worked under condition.
In a kind of embodiment according to the use electric detection means of the present invention, self-test unit is stated
Including：Reference voltage generates subelement, for generating reference voltage；Cycle sets subelement,
Voltage for generating mechanical periodicity, the not same order of the voltage of the mechanical periodicity in the cycle
Section is respectively greater than and less than the reference voltage；First comparator, it is described with reference to electricity for comparing
The voltage of pressure and the mechanical periodicity；And the first transistor, for the knot according to the comparison
Fruit produces the simulation electric leakage signal.In this way, self-test unit can periodically give birth to
Into simulation electric leakage signal.
In a kind of embodiment according to the use electric detection means of the present invention, the under-voltage guarantor
Protecting unit includes the 6th transistor, for being less than the voltage pre-set value in the supply voltage
In the case of, the output end that the cycle sets subelement is connected to the ground, it is described to cause
The voltage of mechanical periodicity is zero.
In a kind of embodiment according to the use electric detection means of the present invention, the under-voltage guarantor
Protecting unit also includes the 7th transistor, in the supply voltage less than the voltage pre-set value
In the case of, the 7th transistor disconnects turning on the 6th transistor.
In a kind of embodiment according to the use electric detection means of the present invention, the under-voltage guarantor
Protecting unit also includes the second comparator, in the supply voltage less than the voltage pre-set value
In the case of, second comparator exports high level to turn on the 6th transistor.
In a kind of embodiment according to the use electric detection means of the present invention, the described 6th is brilliant
Body pipe is triode, diode or controllable silicon.
It is described to use electric-examination in a kind of embodiment according to the use electric detection means of the present invention
Surveying device also includes：Self-inspection or electric leakage selection trigger element, for triggering the leak current fault inspection
Survey pattern or the Auto-Sensing Mode.
According to the present invention use electric detection means a kind of embodiment in, the self-inspection or
Electric leakage selection trigger element includes the 4th transistor and the 5th transistor, by disconnecting the described 4th
Transistor selects the leak current fault detection pattern, Yi Jitong with the 5th transistor is turned on
Cross and turn on the 4th transistor and disconnect the 5th transistor to select the Auto-Sensing Mode.
It is described to use electric-examination in a kind of embodiment according to the use electric detection means of the present invention
Surveying device also includes：Power subsystem, for being powered to be described with electric detection means；And relay
Device holding unit, the closure switched for guard relay after the power-up.
In a kind of embodiment according to the use electric detection means of the present invention, the relay
Holding unit includes reset switch, second transistor and third transistor, wherein, pass through closure
The reset switch causes the second transistor and the third transistor to remain closed, so that
The relay switch is obtained to remain closed.
In a kind of embodiment according to the use electric detection means of the present invention, the relay
Holding unit also includes Fisrt fault display unit, and the Fisrt fault display unit is used to show
The leak current fault.In this way, electricity clearly can be indicated to user and attendant
The leak current fault on road.
In a kind of embodiment according to the use electric detection means of the present invention, the self-inspection list
Member also includes the second fault display unit, and second fault display unit is used to show the use
The failure of electric detection means.In this way, clearly it can refer to user and attendant
Show the failure with electric detection means.
In a kind of embodiment according to the use electric detection means of the present invention, the electric leakage event
Barrier detection unit includes：Detection coil, for detecting leakage current or the simulation electric leakage signal；
Processor, for the testing result of the detection coil to be sent into the self-inspection or electric leakage selection
Trigger element.
In a kind of embodiment according to the use electric detection means of the present invention, in the power supply
The leak current fault detection pattern is triggered in first half cycle of voltage, and in the supply voltage
The second half cycle in trigger the Auto-Sensing Mode.
In this way, the low cost and detection of control leak current fault is single respectively with high reliability
Member and self-test unit work.
In addition, the second aspect of the present invention provides a kind of electric connecting device, it has basis
It is of the present invention to use electric detection means.
To sum up, the present invention uses electro-detection by possess detection of electrical leakage and self-checking function at the same time
On device increase under-voltage protection unit so that self-checking circuit under undervoltage condition without self-inspection,
And avoid false tripping phenomenon.
Brief description of the drawings
By reading the detailed description to non-limiting example made with reference to the following drawings,
The other features, objects and advantages of the present invention will become more apparent upon, wherein：
Fig. 1 shows the logic of the use electric detection means according to one embodiment of the present invention
Block diagram；
Fig. 2 shows the circuit knot of the first embodiment of the use electric detection means according to the present invention
Structure schematic diagram；
Fig. 3 shows the circuit knot of the second embodiment of the use electric detection means according to the present invention
Structure schematic diagram；
Fig. 4 A show the electricity of the under-voltage protection unit according to one embodiment of the present invention
Line structure schematic diagram；
Fig. 4 B are shown according to the under-voltage protection unit of another embodiment of the invention
Electrical block diagram；
Fig. 5 shows the circuit knot of the 3rd embodiment of the use electric detection means according to the present invention
Structure schematic diagram；And
Fig. 6 shows the circuit knot of the fourth embodiment of the use electric detection means according to the present invention
Structure schematic diagram.
Embodiment
, will be a part of with reference to the present invention is constituted in the specific descriptions of following preferred embodiment
Appended accompanying drawing.Appended accompanying drawing, which has been illustrated by way of example, can realize the present invention's
Specific embodiment.The embodiment of example is not intended as all implementations of the limit according to the present invention
Example.It is appreciated that without departing from the scope of the present invention, it is possible to use other implementations
Example, can also carry out structural or logicality modification.Therefore, following specific descriptions are simultaneously
It is nonrestrictive, and the scope of the present invention is limited only by the following claims.
Fig. 1 shows the logic of the use electric detection means according to one embodiment of the present invention
Block diagram.
As shown in figure 1, with electric detection means at least include leak current fault detection unit 4, from
Examine unit 5 and under-voltage protection unit 6.
Wherein, leak current fault detection unit 4 is used to detect the leakage current on supply lines, works as leakage
When electric current is more than or equal to leakage current threshold, then driving switch element disconnects supply access or complete
Into self-inspection.
Self-test unit 5 is used to detect self-inspection or electric leakage selection trigger element 3 and detection of electrical leakage
The operation conditions of unit 4.
Under-voltage protection unit 6 is used to prohibit in the case where supply voltage is less than voltage pre-set value
Only self-test unit produces simulation electric leakage signal.
In addition, also including power subsystem 1, the and of relay holding unit 2 with electric detection means
Self-inspection or electric leakage selection trigger element 3.
Wherein, power subsystem 1 is used to be powered with electric detection means.
Relay holding unit 2 is used for guard relay normal work after the power-up, so that really
Protect as load supplying.
Self-inspection or electric leakage selection trigger element 3 are used to select leak current fault detection pattern or self-inspection
Pattern.When electric leakage signal is self-test signal, then leak current fault detection unit is notified to complete self-inspection；
When the electric leakage signal in circuit is circuit leak current fault signal, then cut off the electricity supply.
Fig. 2 shows the circuit knot of the first embodiment of the use electric detection means according to the present invention
Structure schematic diagram.
As shown in Fig. 2 relay holding unit 2 at least includes：Second transistor Q4,
Three transistor Q5, multiple resistance R18-R20, relay coil, relay switch SW1 and
Fisrt fault display unit D6-2。
Self-inspection or electric leakage selection trigger element 3 at least include：4th transistor Q7, second can
Control silicon Q3, the 5th transistor Q8, reset switch RESET and resistance R23。
Leak current fault detection unit 4 at least includes：Processor IC1 and detection coil.
Self-test unit 5 at least includes：First comparator IC2, the second fault display unit D6-1、
The first transistor Q1, multiple resistance R1-R8And multiple electric capacity C1-C3。
Under-voltage protection unit 6 at least includes：It is embodied as such as the 6th transistor Q9Form
Switch element, electric capacity C40And multiple resistance R25、R26.Wherein the 6th transistor Q9For example
For triode, diode or controllable silicon.
With reference to Fig. 2, trigger element 3, electric leakage event are selected self-inspection or leak current fault separately below
Hinder detection unit 4, self-test unit 5 and under-voltage protection unit 6 in detection leak current fault and self-inspection
In the case of working method be illustrated.
The working method of unit when description detects leak current fault first.
After reset switch RESET closures, A-R18-Q8-B-R20-R19-Q5-D6-2Loop is formed,
Transistor Q8、Q4And Q5Conducting, relay coil normal power supply, relay switch SW1
Closure load is connected, Fisrt fault display unit D6-2Chang Liang.
Selection failure is triggered in self-inspection or leak current fault selection trigger element 3, then the 5th crystal
Pipe Q8Conducting, the 4th transistor Q7Cut-off.
In leak current fault detection unit 4 detection coil detection power supply L, N line on whether
There is leakage current generation.
If now being produced without leakage current, the processor IC1 output low level of pin 5,
Second controllable silicon Q3It can not turn on, so that relay coil is working properly, load supplying is normal.
If now thering is the leakage current for reaching leakage current threshold to produce, leak current fault detection unit
Detection coil in 4, which is received, exports induced voltage to the processor IC1 He of pin 1 after leakage current
3, so that pin 5 exports high level so that the second controllable silicon Q3Conducting, due in self-inspection or
Selection failure is triggered in leak current fault selection trigger element 3, then A-R18-Q8-B-Q3Loop shape
Into and keep optocoupler to turn on, the current potential of B points declines rapidly, and transistor Q4And Q5Cut-off,
Cause the open circuit of relay coil current supply circuit, so that relay switch SW1 disconnects, load is supplied
Electricity is cut off, Fisrt fault display unit D6-2Extinguish.
The working method of unit during circuitry self test is described below.
After reset switch RESET closures, A-R18-Q8-B-R20-R19-Q5-D6-2Loop is formed,
Transistor Q8、Q4And Q5Conducting, relay coil normal power supply, load is connected, the first event
Hinder display unit D6-2Chang Liang.
Self-inspection or the failure selection selection self-inspection of trigger element 3 are triggered, then the 4th transistor Q7
Conducting, the 5th transistor Q8Cut-off.
In leak current fault detection unit 4 detection coil detection power supply L, N line on whether
There is leakage current generation.
Self-test unit 5 periodically produces electric leakage signal.
Self-test unit 5 includes cycle setting subelement, and the cycle sets subelement to include series connection
The resistance R4 and electric capacity C of connection2, the cycle set subelement be further coupled to first comparator IC2
Input (positive pole).Resistance R on first comparator IC24, electric capacity C2Pass through resistance
R1N lines are connected to, electric capacity C is given by resistance R42Charging.
First comparator IC2 positive pole is coupled to resistance R4And C2Between, for receiving electricity
Hold C2On voltage signal, first comparator IC2 negative pole is coupled to by resistance R2、R3Group
Into reference voltage generate subelement, for receiving reference voltage signal.Period modulation component with
Reference voltage generation subelement receives the voltage signal from N.
As electric capacity C2Voltage on (i.e. first comparator IC2 positive pole) is higher than R3(i.e. IC2
Negative pole) on voltage when, there is high level, D-R in IC2 output switching activity, C points23-Q7、
C-R5-Q1、C-R6-D6-1、C-R7-C3Loop is formed, and the second indicating fault is lighted；Q7Lead
Lead to and Q8Cut-off.Self-inspection or the failure selection selection self-inspection triggering of trigger element 3 are completed.
C points are coupled to the first transistor Q by resistance R51Base stage, therefore, C points one
Denier exports high level, Q1Just turn on so that N-R18-Q1-D1- L lines formation current loop, gives
Detection coil in leak current fault detection unit 4 introduces presetting electric current IC(electric current IC
It should be greater than or detected equal to leak current fault the threshold value I of electric currentf)。
Detection coil receives electric leakage signal and produces induced voltage so that on IC1 pin 5
High level signal is exported, so that the second controllable silicon Q3Conducting.Now, electric capacity C2Pass through
D5、Q3Discharged so that first comparator IC2 cathode voltage is reduced rapidly.
When first comparator IC2 positive pole level less than negative electricity usually, first comparator IC2
Output end upset, C points be low level, the first transistor Q1It is turned off, the second failure refers to
Show extinguishing.Now detection coil does not detect electric leakage signal, IC1 pin 5 and Q3's
Controlled stage is low level；Electric capacity C2On electric charge released, its voltage decline, so as to be less than
Second controllable silicon Q3With diode D5The threshold voltage of conducting；Electric capacity C2While electric discharge
A-R18-R13-B-Q3Loop is formed so that Q3It will not be maintained after conducting, complete to end after self-inspection.
Self-test unit repeats said process.
Situation 1：When with electric detection means normal work, after reset switch RESET closures,
Load supplying, then Fisrt fault display unit D6-2Chang Liang should be kept.During normal power-up, from
The second fault display unit D during inspection6-1Should periodic flicker.If pressing test switch
TEST, then form L-R11- N loop, relay coil loop disconnects, i.e. relay switch
SW1 disconnects, load power down, Fisrt fault display unit D6-2Extinguish.After multiplicating, then
Proof is normal with the function of electric detection means.
Situation 2：After circuit electrification reset, if Fisrt fault display unit D6-2Can not
Normal bright or the second fault indication unit D6-1When being unable to periodic flicker, then fault display unit
It is abnormal, it can not be continuing with electric detection means.
(such as electric capacity C if leak current fault detection unit 4 breaks down5Short circuit, processor
IC1 damages etc.) and cause creepage protection function to lose；Or presetting current value IfBecome big
The leakage current I for causing self-test unit to produceCLess than If, now, processor IC1 pin 5 will
Export low level, i.e. the second controllable silicon Q3It is not turned on (can also being the second controllable silicon Q3Damage,
Such as Q3Open circuit or Q3Trigger pin short circuit), now the second fault indication unit D6-1Continue bright
Rise, to point out user's earth leakage protective device to be continuing with.
If now the second controllable silicon Q3, diode D5And D8Do not damage, then the first ratio
It will pass through resistance R compared with device IC27Give electric capacity C3Charging, when current potential reaches setting value, two poles
Pipe D8With the second controllable silicon Q3Conducting, first comparator IC2 will persistently export high level, the
One transistor Q1 is turned on all the time, therefore, the second controllable silicon Q3By constant conduction.When circuit by
When self-inspection triggering is switched to leak current fault triggering, A-R18-Q8-B-Q3Loop is turned on, optocoupler conducting,
Transistor Q4、Q5Cut-off, relay coil loop disconnects, so as to cause relay switch SW1
Be disconnected, that is, be disconnected input with export it is electrically connected so that product can not be continuing with,
To ensure user security.
If there is no electric current to pass through in relay coil short circuit or open circuit, coil, then with coil
The relay switch SW1 of linkage disconnects；
If the 5th transistor Q8(short circuit or open circuit) is damaged, then transistor Q4Or Q5
Q3Self-inspection ends when turning on, and relay coil loop disconnects；
If the 4th transistor Q7 damages (short circuit or open circuit), transistor Q4Or Q5
In Q3Self-inspection ends when turning on, and relay coil loop disconnects；
If optocoupler damages (short circuit or open circuit), transistor Q4Or Q5In Q3During conducting
At least one cut-off, relay circuit disconnects；
If transistor Q4、Q5It is one of to damage (short circuit or open circuit), due to Q4、
Q5It is connected in relay circuit, when failure is turned off, Q4、Q5Electricity can all be turned off, then Q4、
Q5Damage do not interfere with circuit turn-off function.
In addition, electric capacity C20Selection is automatic (relay switch SW1 is closed automatically after upper electricity)
Or Electricity Functional on manual (then relay switch SW1 is closed pressure reset switch RESET).
For self-inspection or leak current fault selection trigger element 3, when self-test unit is sent from signal
When, transistor Q7Conducting, Q8Disconnection, Q3Conducting；The transistor when being connected to leak current fault
Q7Closing, Q2Conducting, Q3Conducting.
In addition, when the voltage that power subsystem 1 is provided is preset less than rated voltage or one
Voltage pre-set value when, then being caused by the effect of under-voltage protection unit 6 can not be to self-inspection list
Electric capacity C in member 52Charged.Specifically, one end of under-voltage protection unit 6 is coupled to
Resistance R4And C2Between, and the other end is coupled to power subsystem 1.When supply voltage is relatively low,
The 6th transistor Q in under-voltage protection unit 69Turn on and by R4And C2Indirectly, from
And be no longer able to electric capacity C2Charged.In this case, in IC2 output end
C points maintain low level, this prohibits self-test unit 5 and periodically produces electric leakage signal.
Fig. 3 shows the circuit knot of the second embodiment of the use electric detection means according to the present invention
Structure schematic diagram.
As shown in figure 3, electric detection means includes electric-leakage detection circuit and self-checking circuit.Electric leakage
Detection circuit is used for detecting in supply lines whether produce leak current fault.And self-checking circuit is used to detect
Whether electric-leakage detection circuit being capable of normal work.Two circuits are configured to, respectively
The positive-negative half-cycle for the sinusoidal ac being operated in supply lines, i.e., detect electric leakage in a half cycle
Failure, and detect whether leak current fault circuit is normal in another half cycle.
Electric-leakage detection circuit includes：Detection coil ZCT, solenoid SOL, thyristor
The elements such as Q1, diode D5 and processor IC1.It is understood that thyristor
Q1 can also be replaced with other elements for possessing switching function, for example, metal-oxide-semiconductor.
Self-checking circuit includes：Comparing unit IC2 and simulation electric leakage stream generation unit, wherein,
Comparing unit periodically produces comparative result, and then drives simulation electric leakage stream generation unit to produce
Leakage current, simulation electric leakage stream generation unit then produces first at least one supply lines and leaked electricity
Stream.
It should be understood that here simulation electric leakage stream generation unit produced by be self-checking circuit
The electric current actively produced, for simulating leakage current produced during power supply trouble.
Coil ZCT two ends are coupled to processor IC1 pin 1 and 3, when ZCT outputs
Voltage change when being more than threshold value, otherwise the IC1 output high level of pin 5, exports low electricity
It is flat.Rectifier bridge D1-D4 is respectively coupled to live wire (L), N lines, and passes through resistance R3 couplings
IC1 pin 6 is connected to, so that in two half cycles working power can be provided for IC1.IC1's
Pin 7 is coupled to coil RING2, the changing value for reading the induced voltage on RING2.
Branch road auxiliary switch SW1 and reset switch RESET links, i.e. RESET closures,
SW1 is also closed, and vice versa.
After reset switch RESET resets, L, N supply lines are by upper electricity, ac power waveform
For sine wave.
Electric-leakage detection circuit, self-checking circuit are illustrated in the working condition of each half cycle respectively,
For the ease of illustrating, here by taking positive half cycle, negative half period as an example.
Positive half cycle：Detect leak current fault
In the half cycle, SW1 and RESET is closed, and is on ZCT detection L, N lines
It is no to have leakage current generation.
If now being produced without leakage current, IC1 exports low level, controllable silicon in pin 5
Q1 can not be turned on, so that the electric current in solenoid SOL will not produce change, so as to will not make
RESET disconnections must be switched.
If now there is leakage current generation, the pin 1 of ZCT output induced voltages to IC1,
After 3, IC1 exports high level in pin 5, so as to turn on controllable silicon Q1.Now, solenoid
Electric current in SOL will produce larger change because of the conducting of controllable silicon so that RESET
Disconnect, and then disconnect switch SW1, cut off L lines to the current path of N lines.
When supply access keeps power supply state, i.e., the electric current in solenoid is not produced because controllable
Caused by silicon Q1 during the larger change of electric current, solenoidal Fisrt fault display unit is coupled to
(including resistance R4 and LED 1) will send display signal always, to inform
Now RESET switches are closed user.After controllable silicon Q1 is turned on, reset switch RESET
It will be switched off, now Fisrt fault display unit will no longer be shown, so as to inform that user now powers
Path is already off.In addition, when solenoid SOL is damaged, i.e. the coil formation of SOL is resolved
Road, now Fisrt fault display unit also no longer show.
For self-checking circuit 2, because N lines are not powered now to it, therefore,
Positive half cycle, electric-leakage detection circuit 1 works, and self-checking circuit 2 does not work.
Negative half period：Circuitry self test
Similar, in the half cycle, SW1 and RESET is closed, ZCT detections L, N
Whether there is leakage current generation on line.
Self-checking circuit 2 also includes cycle setting component, and the cycle sets component to include the company of series connection
The resistance R9 and electric capacity C10 connect, the cycle sets component to be further coupled to thyristor Q1 and ratio
Compared with the first input end (positive pole) of unit.Obviously, when controllable silicon Q1 is turned on, it can
The path of the charge discharging resisting on electric capacity C10 is provided, so as to reduce electric capacity C10 voltage.
The positive pole of comparing unit is coupled between resistance R9 and electric capacity C10, for receiving electricity
Hold the voltage signal on C10, the negative pole of comparing unit, which is coupled to, includes resistance R7, R8 ginseng
Voltage generating unit is examined, for receiving reference voltage signal.Therefore, period modulation component and ginseng
Examine voltage generating unit and receive the voltage signal on N lines
Situation 1：Electric-leakage detection circuit is working properly：
Because the resistance R9 on IC2 positive poles, electric capacity C10 by resistance R5 are connected to N lines,
Therefore, the resistance R9 being connected on IC2 positive poles will charge in the half cycle to electric capacity C10.Work as C10
On voltage higher than voltage (i.e. IC2 negative pole) on R7 when, IC2 output end will be instead
Turn, high level occur in IC2 output ends.
IC2 output ends are coupled to triode Q2 base stage, therefore, IC2 by resistance R11
Output end once exports high level, and Q2 is just turned on, and then the current potential at drop-down R13, and Q2
The time of conducting then holds time depending on the high level of IC2 output ends.Q2 conducting, gives
ZCT introduces pre-set value electric current Ic, it is clear that electric current Ic should be greater than or equal to leak current fault
The threshold value If of electric current is detected, otherwise IC1 can not be by the output letter corresponding to electric current Ic ZCT
Number it is identified as effective electric leakage signal.Therefore, confession is introduced by triode Q2 and resistance R13
The leakage current of ZCT detections, L lines are flow to from the D2 in the rectified bridge of Q2 emitter stage, with
Form current loop.
For electric current Ic, output signals of the IC1 based on ZCT exports high electricity on pin 5
Ordinary mail number, so that controllable silicon Q1 is turned on.Now, then diode D6 also will for Q1 conductings
Conducting, electric capacity C10 positive pole and IC2 positive pole, therefore electric capacity are connected on due to diode D6
C10 will be discharged by diode D6, controllable silicon Q1 so that IC2 cathode voltage is fast
Prompt drop is low, and then causes IC2 output ends to be reversed to low level.
When IC2 positive poles level is less than negative electricity usually, IC2 output end exports low level,
Triode Q2 is closed.Now, due to stopping to ZCT offers electric current, (i.e. electric current Ic is simultaneously
Do not produce), ZCT is not detected by leakage current, therefore, IC1 pin 5 and Q1 control
Extremely zero level, it is known that, this is when negative half period electric-leakage detection circuit is working properly, controllable silicon
The current potential that Q1 conducting is depended on electric capacity C10.Because electric charge is released on electric capacity C10,
Its voltage will also decline, so as to be unable to reach the threshold of controllable silicon Q1 and/or diode D6 conductings
Threshold voltage, therefore, controllable silicon Q1 will be now closed.
When leak current fault detection circuit is working properly and preset current value If does not change
When, next cycle starts to charge for electric capacity C10, repeats process as above.Can be by changing
C10 and R9 parameter adjusts the length of detection cycle, and the detection cycle can be alternating current
The integral multiple in cycle.
Situation 2：Electric-leakage detection circuit work is abnormal
Now, electric-leakage detection circuit breaks down or preset current value If becomes big, such as electric
Holding C2 open circuits, IC1 damages etc. causes electric-leakage detection circuit 1 to lose earth leakage protective ability, or
It is that the big leakage current Ic for causing self-test unit to produce of preset current value If changes is less than If, now,
IC1 pin 5 will export low level, i.e. Q1 and be not turned on.Now, electric capacity C10 is not put
Circuit, so as to cause electric capacity C10 current potential to be consistently higher than the defeated of IC2 negative pole end, i.e. IC2
Go out to support continuous output high level, so triode Q2 is turned on all the time, LED2 is persistently lighted,
To point out user's earth leakage protective device to be continuing with.
It is relatively more single if now controllable silicon Q1, diode D6 and D7 are not damaged
First IC2 will be charged by resistance R12 to electric capacity C11, when current potential reaches setting value, and two
Pole pipe D7 conductings, Q1 conductings.Because now comparing unit IC2 will persistently export high level,
Therefore, controllable silicon Q1 conducting increases the electric current moment caused in solenoid SOL, so that
Disconnect reset switch RESET, that is, be disconnected input with export it is electrically connected, promote user not
It can use.
In addition, when the voltage that power subsystem is provided is less than rated voltage, then being protected by under-voltage
The effect of shield unit not charging to the electric capacity C10 in self-test unit.Specifically,
Under-voltage protection unit 6 include the 6th transistor Q9, electric capacity C40 and multiple resistance R24,
R25 and R26.One end of under-voltage protection unit 6 is coupled between resistance R9 and electric capacity C10,
And the other end is coupled to power supply.When supply voltage is relatively low, the in under-voltage protection unit 6 the 6th
Transistor Q9 turn on and by R9 and C10 indirectly, so as to be no longer able to electric capacity C10
Charged.In this case, low level is maintained in IC2 output end, this is prohibited
Self-test unit periodically produces electric leakage signal.
Fig. 4 A are shown according to the under-voltage protection unit 6 of one embodiment of the present invention
Electrical block diagram.
As shown in Figure 4 A, under-voltage protection unit 6 includes the 6th transistor Q9, the 7th crystal
Pipe Q10, electric capacity C40And multiple resistance R24、R25、R27And R28.In figure, a, b
With shown in the position reference picture 1 of c points.Specifically, when supply voltage (a points voltage) is relatively low
When, the 7th transistor Q10Disconnect, and the 6th transistor Q9Conducting, self-test unit 5 can not work
Make.Conversely, when supply voltage is normal, the 7th transistor Q10Conducting, and the 6th transistor
Q9Disconnect, then self-test unit 5 being capable of normal work.
Fig. 4 B are shown according to the under-voltage protection unit of another embodiment of the invention
Electrical block diagram.
As shown in Figure 4 B, under-voltage protection unit 6 includes the 6th transistor Q9, second compare
Device U1B, electric capacity C40And multiple resistance R24、R25And R26.In figure, a, c and d
Shown in the position reference picture 1 of point.Specifically, when supply voltage (a points voltage) is relatively low,
Second comparator U1B exports high level, the 6th transistor Q9Conducting, self-test unit 5 can not
Work.Conversely, when supply voltage is normal, the 6th transistor Q9Disconnect, then self-test unit 5
Being capable of normal work.
Fig. 5 shows the circuit knot of the 3rd embodiment of the use electric detection means according to the present invention
Structure schematic diagram.Fig. 5's and Fig. 3 differs only in the 6th crystal in under-voltage protection unit 6
Pipe Q9 replaces with diode D10.When supply voltage is relatively low, diode D10 conductings, from
And self-test unit can not work.Conversely, when supply voltage is normal, diode D10 disconnects,
Then self-test unit being capable of normal work.
Fig. 6 shows the circuit knot of the fourth embodiment of the use electric detection means according to the present invention
Structure schematic diagram.Connected between Fig. 6 and Fig. 5 one end for differing only in under-voltage protection unit 6
To L lines, under-voltage protection can be just carried out without closure switch TEST.
Although the foregoing describing the embodiment of the present invention, technology in the art
Personnel can make various changes and modifications within the scope of the appended claims.
Claims (15)
1. one kind electric detection means, it is characterised in that including：
Self-test unit, for periodically producing simulation electric leakage signal in Auto-Sensing Mode；
Leak current fault detection unit, for detecting the simulation electric leakage letter in the Auto-Sensing Mode
Number, and detect leak current fault in leak current fault detection pattern；And
Under-voltage protection unit, for supply voltage be less than voltage pre-set value in the case of forbid
The self-test unit produces the simulation electric leakage signal.
2. use electric detection means according to claim 1, it is characterised in that it is described from
Inspection unit includes：
Reference voltage generates subelement, for generating reference voltage；
Cycle sets subelement, the voltage for generating mechanical periodicity, the electricity of the mechanical periodicity
The different phase for being pressed in the cycle is respectively greater than and less than the reference voltage；
First comparator, the voltage for comparing the reference voltage and the mechanical periodicity；With
And
The first transistor, for producing the simulation electric leakage signal according to the result of the comparison.
3. use electric detection means according to claim 2, it is characterised in that described to owe
Protection location is pressed to include the 6th transistor, for default less than the voltage in the supply voltage
In the case of definite value, the output end that the cycle sets subelement is connected to the ground, to cause
The voltage of the mechanical periodicity is zero.
4. use electric detection means according to claim 3, it is characterised in that described to owe
Protection location is pressed also to include the 7th transistor, it is presetting less than the voltage in the supply voltage
In the case of value, the 7th transistor disconnects turning on the 6th transistor.
5. use electric detection means according to claim 3, it is characterised in that described to owe
Protection location is pressed also to include the second comparator, it is presetting less than the voltage in the supply voltage
In the case of value, second comparator exports high level to turn on the 6th transistor.
6. the use electric detection means according to any one of claim 2 to 5, its feature
It is, the 6th transistor is triode, diode or controllable silicon.
7. use electric detection means according to claim 1, it is characterised in that the use
Electric detection means also includes：
Self-inspection or electric leakage selection trigger element, for triggering the leak current fault detection pattern or institute
State Auto-Sensing Mode.
8. use electric detection means according to claim 7, it is characterised in that it is described from
Inspection or electric leakage selection trigger element include the 4th transistor and the 5th transistor, described by disconnecting
4th transistor selects the leak current fault detection pattern with the 5th transistor is turned on, with
And select the self-inspection by turning on the 4th transistor and disconnecting the 5th transistor
Pattern.
9. according to according to claim 7 or 8 use electric detection means, it is characterised in that
It is described also to be included with electric detection means：
Power subsystem, for being powered to be described with electric detection means；And
Relay holding unit, the closure switched for guard relay after the power-up.
10. use electric detection means according to claim 9, it is characterised in that it is described after
Electrical equipment holding unit includes reset switch, second transistor and third transistor, wherein, pass through
The reset switch is closed so that the second transistor and the third transistor are remained closed,
To cause the relay switch to remain closed.
11. use electric detection means according to claim 10, it is characterised in that described
Relay holding unit also includes Fisrt fault display unit, and the Fisrt fault display unit is used
In the display leak current fault.
12. use electric detection means according to claim 1, it is characterised in that it is described from
Examining unit also includes the second fault display unit, and second fault display unit is used to show institute
State the failure with electric detection means.
13. use electric detection means according to claim 1, it is characterised in that the leakage
Electric fault detection unit includes：
Detection coil, for detecting leakage current or the simulation electric leakage signal；
Processor, for the testing result of the detection coil to be sent into the self-inspection or electric leakage
Select trigger element.
14. use electric detection means according to claim 1, it is characterised in that described
The leak current fault detection pattern is triggered in first half cycle of supply voltage, and in the power supply
The Auto-Sensing Mode is triggered in second half cycle of voltage.
15. a kind of electric connecting device, with according to any one of claim 1 to 14
Use electric detection means.
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| CN201610202233.9A CN107294059B (en) | 2016-04-01 | 2016-04-01 | Use electric detection means |
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|---|---|---|---|
| CN201610202233.9A CN107294059B (en) | 2016-04-01 | 2016-04-01 | Use electric detection means |
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| CN107294059B CN107294059B (en) | 2019-11-05 |
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| CN108306257A (en) * | 2018-04-07 | 2018-07-20 | 佛山市顺德区信辉达电子有限公司 | Three pole break-make leakage protecting plug of intelligent control type |
| CN108901096A (en) * | 2018-05-23 | 2018-11-27 | 泉芯电子技术(深圳)有限公司 | Line voltage electricity leakage detection control circuit and method |
| CN109411301A (en) * | 2018-09-27 | 2019-03-01 | 杭州四方博瑞科技股份有限公司 | Intelligent breaker with Data Detection function |
| CN109449059A (en) * | 2018-09-27 | 2019-03-08 | 杭州四方博瑞科技股份有限公司 | Intelligent breaker with self-checking function |
| CN110661275A (en) * | 2019-08-29 | 2020-01-07 | 许继集团有限公司 | Phase-change switch |
| CN111474422A (en) * | 2019-01-24 | 2020-07-31 | 上海复旦微电子集团股份有限公司 | Ground fault protection system |
| CN113050467A (en) * | 2020-12-01 | 2021-06-29 | 国网黑龙江省电力有限公司经济技术研究院 | Power utilization safety monitoring and protecting device |
| CN113659519A (en) * | 2021-05-21 | 2021-11-16 | 上海蕴原电器有限公司 | Failure automatic monitoring circuit and ground fault circuit breaker using same |
| CN113848509A (en) * | 2021-09-16 | 2021-12-28 | 南京康尼新能源汽车零部件有限公司 | Charging equipment electric leakage self-checking device and self-checking method |
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| CN113659519A (en) * | 2021-05-21 | 2021-11-16 | 上海蕴原电器有限公司 | Failure automatic monitoring circuit and ground fault circuit breaker using same |
| CN113848509A (en) * | 2021-09-16 | 2021-12-28 | 南京康尼新能源汽车零部件有限公司 | Charging equipment electric leakage self-checking device and self-checking method |
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